John Petrucci Signature Music Man Comparison Chart WiredGuitarist January 25, 2016 Articles Confused about all of the variations of the John Petrucci signature model that Music Man makes? It’s OK, there are a lot of them! We put this handy comparison chart together so you can tell what the core differences are between models. To view the chart click here. Once it is open, you can download the chart via the icon beside the print button. If you’re looking for a new guitar, don’t forget to stop by our new online guitar store, we carry most major brands!